xworm | 9288e4eacb3b5fb5cab221ed394a1bfeb8772ef73d9fc2b94f6f048bf216145e

General

Target

XClient.exe
Size

41KB
MD5

6b198a7541ecf96b2270ff1456a09c6c
SHA1

7c005c9633ffca8c9e0f2703d8203dc794d590bb
SHA256

9288e4eacb3b5fb5cab221ed394a1bfeb8772ef73d9fc2b94f6f048bf216145e
SHA512

8c56f1594aee97988b31e81be330e988bd9a0507adbdfe9130d66d9c29185b4a81b9b0a85dbbf0c30df6515339c896454ed9950f27867b296547eddacc6c2ab4
SSDEEP

768:xrJDweBDuOkScrbsN/x6WECAr43M4fJF5Pa9p+1e6iOwhg3/mb6:XDwewicrbsN/YDRrcRF49Ik6iOwa+W

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

C2

147.185.221.23:38042

Mutex

goHYBdttt82QbjP4

Attributes

Install_directory
%AppData%
install_file
SystemUser32.exe

aes.plain

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral1/memory/3608-1-0x0000000000A30000-0x0000000000A40000-memory.dmp	family_xworm
behavioral1/files/0x002000000002ab8a-58.dat	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Xworm family
xworm

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
1040	powershell.exe
1640	powershell.exe
2908	powershell.exe
3456	powershell.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\SystemUser32.lnk	XClient.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\SystemUser32.lnk	XClient.exe

Executes dropped EXE 2 IoCs

pid	Process
1520	SystemUser32.exe
3348	SystemUser32.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1537126222-899333903-2037027349-1000\Software\Microsoft\Windows\CurrentVersion\Run\SystemUser32 = "C:\\Users\\Admin\\AppData\\Roaming\\SystemUser32.exe"	XClient.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
1	ip-api.com

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
3264	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
1640	powershell.exe
1640	powershell.exe
2908	powershell.exe
2908	powershell.exe
3456	powershell.exe
3456	powershell.exe
1040	powershell.exe
1040	powershell.exe
3608	XClient.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	3608	XClient.exe
Token: SeDebugPrivilege	1640	powershell.exe
Token: SeDebugPrivilege	2908	powershell.exe
Token: SeDebugPrivilege	3456	powershell.exe
Token: SeDebugPrivilege	1040	powershell.exe
Token: SeDebugPrivilege	3608	XClient.exe
Token: SeDebugPrivilege	1520	SystemUser32.exe
Token: SeDebugPrivilege	3348	SystemUser32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3608	XClient.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 3608 wrote to memory of 1640	3608	XClient.exe	82
PID 3608 wrote to memory of 1640	3608	XClient.exe	82
PID 3608 wrote to memory of 2908	3608	XClient.exe	84
PID 3608 wrote to memory of 2908	3608	XClient.exe	84
PID 3608 wrote to memory of 3456	3608	XClient.exe	86
PID 3608 wrote to memory of 3456	3608	XClient.exe	86
PID 3608 wrote to memory of 1040	3608	XClient.exe	88
PID 3608 wrote to memory of 1040	3608	XClient.exe	88
PID 3608 wrote to memory of 3264	3608	XClient.exe	90
PID 3608 wrote to memory of 3264	3608	XClient.exe	90

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\XClient.exe
"C:\Users\Admin\AppData\Local\Temp\XClient.exe"
1⤵
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3608
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1640
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2908
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\SystemUser32.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3456
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'SystemUser32.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1040
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "SystemUser32" /tr "C:\Users\Admin\AppData\Roaming\SystemUser32.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3264

C:\Users\Admin\AppData\Roaming\SystemUser32.exe
C:\Users\Admin\AppData\Roaming\SystemUser32.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1520

C:\Users\Admin\AppData\Roaming\SystemUser32.exe
C:\Users\Admin\AppData\Roaming\SystemUser32.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3348

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\SystemUser32.exe.log

Filesize
654B

MD5
2cbbb74b7da1f720b48ed31085cbd5b8

SHA1
79caa9a3ea8abe1b9c4326c3633da64a5f724964

SHA256
e31b18f21621d9983bfdf1ea3e53884a9d58b8ffd79e0e5790da6f3a81a8b9d3

SHA512
ecf02d5240e0c1c005d3ab393aa7eff62bd498c2db5905157e2bf6d29e1b663228a9583950842629d1a4caef404c8941a0c7799b1a3bd1eb890a09fdb7efcff9

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
627073ee3ca9676911bee35548eff2b8

SHA1
4c4b68c65e2cab9864b51167d710aa29ebdcff2e

SHA256
85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c

SHA512
3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
aa4f31835d07347297d35862c9045f4a

SHA1
83e728008935d30f98e5480fba4fbccf10cefb05

SHA256
99c83bc5c531e49d4240700142f3425aba74e18ebcc23556be32238ffde9cce0

SHA512
ec3a4bee8335007b8753ae8ac42287f2b3bcbb258f7fc3fb15c9f8d3e611cb9bf6ae2d3034953286a34f753e9ec33f7495e064bab0e8c7fcedd75d6e5eb66629

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
781da0576417bf414dc558e5a315e2be

SHA1
215451c1e370be595f1c389f587efeaa93108b4c

SHA256
41a5aef8b0bbeea2766f40a7bba2c78322379f167c610f7055ccb69e7db030fe

SHA512
24e283aa30a2903ebe154dad49b26067a45e46fec57549ad080d3b9ec3f272044efaaed3822d067837f5521262192f466c47195ffe7f75f8c7c5dcf3159ea737

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
4397b0d1a82fec8a95f1ab53c152c5a5

SHA1
3632ed4f2b65fd0df29b3d3725e3a611d2e1adf7

SHA256
10cece13749ac090c815e53dc5e248b4b9c3ba93dc3d434d97d22f12a3906734

SHA512
f0d21ab75d08e1cb4ac83507f9ca41ef5365027b0d7e27747ded44b76fdb0346ca2d7499697802c5b67696e0c73716fcfab698825a143515151001690804d59f

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_udyyjcx5.gtd.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\SystemUser32.exe

Filesize
41KB

MD5
6b198a7541ecf96b2270ff1456a09c6c

SHA1
7c005c9633ffca8c9e0f2703d8203dc794d590bb

SHA256
9288e4eacb3b5fb5cab221ed394a1bfeb8772ef73d9fc2b94f6f048bf216145e

SHA512
8c56f1594aee97988b31e81be330e988bd9a0507adbdfe9130d66d9c29185b4a81b9b0a85dbbf0c30df6515339c896454ed9950f27867b296547eddacc6c2ab4

Download Submit
memory/1640-15-0x00007FFE79A50000-0x00007FFE7A512000-memory.dmp

Filesize
10.8MB

Download
memory/1640-16-0x00007FFE79A50000-0x00007FFE7A512000-memory.dmp

Filesize
10.8MB

Download
memory/1640-19-0x00007FFE79A50000-0x00007FFE7A512000-memory.dmp

Filesize
10.8MB

Download
memory/1640-14-0x00007FFE79A50000-0x00007FFE7A512000-memory.dmp

Filesize
10.8MB

Download
memory/1640-13-0x00007FFE79A50000-0x00007FFE7A512000-memory.dmp

Filesize
10.8MB

Download
memory/1640-12-0x0000021AAEC80000-0x0000021AAECA2000-memory.dmp

Filesize
136KB

Download
memory/1640-3-0x00007FFE79A50000-0x00007FFE7A512000-memory.dmp

Filesize
10.8MB

Download
memory/3608-0-0x00007FFE79A53000-0x00007FFE79A55000-memory.dmp

Filesize
8KB

Download
memory/3608-21-0x00007FFE79A53000-0x00007FFE79A55000-memory.dmp

Filesize
8KB

Download
memory/3608-56-0x00007FFE79A50000-0x00007FFE7A512000-memory.dmp

Filesize
10.8MB

Download
memory/3608-2-0x00007FFE79A50000-0x00007FFE7A512000-memory.dmp

Filesize
10.8MB

Download
memory/3608-1-0x0000000000A30000-0x0000000000A40000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads